Answer:
6
Step-by-step explanation:
To calculate <em>x+10</em>, we first need to find <em>x</em>. To do this, we can use the first equation.
We are given the equation:
To solve for <em>x</em>, turn one side of the equation into 0 and solve. Therefore:
So, the possible values for <em>x</em> are -4 and 12.
However, we are also told that <em>x<0</em>. In other words, <em>x</em> must be negative. Thus, we can remove 12. That leaves us with: <em>x=-4. </em>
So:
The regression equation is , and it will take 31 weeks to have $50.00
<u>(a) The linear regression equation</u>
To do this, we make use of a graphing calculator;
From the graphing calculator, we have the following calculation summary:
The regression equation is then represented as:
Where:
and
So, we have:
Approximate
Approximate
This means that, the regression equation is
<u>(b) Predict the time to have $50.00</u>
This means that:
So, we have:
Subtract 1.29 from both sides
Divide both sides by 1.56
Rewrite as:
Approximate
Hence, it will take 31 weeks to have $50.00
Read more about linear regression models at: